[CQ-Contest] ARRL Rtty roundup

I have a question about the ARRL RTTY roundup
currently going on. The rules state that you must use
digital modes, and it lists Baudot RTTY, PSK31, ASCII,
AMTOR, and packet. Are these the only digital modes
allowed? What about Hellschreiber and MFSK16? I was
hoping to do the contest as Hellscheiber only. If it
is allowed, look for me calling CQ on 14.063, 14.080,
and 21.063 FELDHELL
73s John NE0P
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